Home / 20,920.60-31,381.86-8,270.32

Finding the Fourth Proportional to 20,920.60, 31,381.86 and 8,270.32

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Solution

The fourth proportional to 20,920.60, 31,381.86 and 8,270.32 is: 12,405.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.60 : 31,381.86 = 8,270.32 : x
  2. Step 2: Convert to fraction form
    20,920.60/31,381.86 = 8,270.32/x
  3. Step 3: Cross multiply
    20,920.60x = 31,381.86 × 8,270.32
  4. Step 4: Simplify right side
    20,920.60x = 259,538,024.40
  5. Step 5: Solve for x
    x = 259,538,024.40/20,920.60
  6. Step 6: Final answer
    x = 12,405.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.